Sand Francisco, California - About 100 people were evacuated from a busy, four-block area after an employee found a homemade bomb in the bathroom of a Starbucks. No one was injured.

The device, which was found around 1:15 p.m. Monday, was disabled an hour later. Residents were allowed back into the building and police reopened the street around the store.

"This was a good device. If it had exploded, it would have caused injuries or damage," said Sgt. Neville Gittens.

He would not disclose the size or type of device found, or its potential explosive capacity. But, he added, "we have some very active leads that we're following up."

The coffee store remained closed Monday evening while authorities investigated. Gittens said no one phoned in a bomb threat or took responsibility for the device.

Seattle-based Starbucks declined to provide further details.

In 2003, police said the windows of 17 Starbucks stores were clouded with glue and some of the door locks were jammed. Vandals also posted phony notices purporting to be from Starbucks management announcing the company's intention to abandon some of their San Francisco stores to make room for more locally owned coffee houses.